physiology MCQs – Page 10

A. Adaptation

C. Refractoriness

D. Electrotonus

A. Prothrombin

C. Vitamin K

D. Calcium

B. HbS

C. HbM

D. HbH

A. Fibrin

B. Stable factor

D. Thromboplastin

A. Sympathetic

B. Somatic only

C. Parasympathetic

A. 4.25

C. 2.5

D. 9.5

A. Right and left bundle branches

B. Bundle of HIS

D. AV node

A. Longer than refractory period in skeletal muscle

B. Lasts till cardiac contraction

D. A phase of cardiac cycle in which heart cannot be stimulated by any amount of stimulus

E. Corresponds with duration of action potential

B. Closure of the aortic and pulmonary valves

C. Opening of the mitral and tricuspid valves

D. Opening of the aortic and pulmonary valves

A. Decrease in density of blood

B. Decrease in velocity of blood

C. Reynolds number < 2000

A. Proximal cut end of nerve with cell body

C. Both the free ends of the cut nerve

D. All are true

A. Isotonic contraction

B. Isotonic relaxation

D. Isovolumetric relaxation

A. Isovolumetric contraction

B. Pre-systole

C. Pre-diastole

A. Parasympathetic impulses

B. Sympathetic impulse

C. Hormones

A. Spinocerebellar tract

C. Dorsal column

D. Corticospinal tract

A. Increased AV node excitability

B. Decreased ventricular contraction

D. Tachycardia

A. Venules

C. Capillaries

D. Precapillary sphincters

A. Pons

B. MIdbrain

C. Cerebellum

B. Sweat secretion

C. Arteriolar constriction

D. Ciliary muscle contraction

B. 0.3 seconds

C. 0.7 seconds

D. 0.7 seconds

A. Starlings law of heart states that increase in force of contraction is directly related to cardiac ouput

B. Stalings law of heart states that the force of ventricular contraction is directly related to the end diastolic volume

D. None of the above

B. The cervical ganglion

C. All cardiac muscle

D. The bundle of His

A. Brain

B. Heart

C. Kidney

B. A-beta fibers

C. A-alpha fibers

D. A-gamma fibers

A. Cardiac efficiency

C. Cardiac index

D. Mean arterial pressure

A. Rapid filling of the left ventricle

B. Closure of the pulmonary valve

D. Contraction of the atria

B. -90 mv

C. -55 mv

D. + 35 mv

A. GABA

B. Nor epinephrine

C. Acetyl choline

A. Does not operate in the failing heart

B. Explains the increase in cardiac output when the sympathetic nerves supplying the heart stimulated

C. Does not operate during exercise

A. cardiac output and body weight

C. Cardiac output and work of the heart

D. Stroke volume and pulse rate

A. Arteries

C. Capillaries

D. Venules

A. Peripheral resistance

B. Heart rate

D. Venous return

A. 30 ml

B. 130 ml

D. 5 liters

A. X

C. XII

D. VII

B. Increase in heart rate

C. Increased sympathetic discharge

D. Decreased vagal discharge

B. Measures the change in CO2 in venous blood

C. Measures Po2 in venous blood

D. Measures the changed in CO2 in arterial blood

A. Reflex tachycardia

B. Reflex Hypercapnia

C. Reflex hyperpnea

A. Constriction of the pupil

B. Far sightedness

D. Dilation of the pupil

A. SA node

B. Purkinje fibers

D. SA node

B. Total Capacity

C. Peripheral vascular resistance

D. Pulse Pressure

B. AV node

C. Bundle of His

D. SA node

A. Blood pressure X cardiac rate

B. Peripheral resistance X tissue fluid

C. Peripheral resistance X cardiac rate

A. fibers

C. fibers

D. Parasympathetic fibers

A. Hypothalamus

C. Midbrain

D. Spinal cord

A. Systolic pressure estimation tends to be lower than those make by palpatory method

C. The sounds that are heard are generated in heart

D. The loudest sound is the diastolic pressure

A. Blood insulin levels

C. Gastric dilatation

D. All of the above

A. When ventricular pressure falls below aortic pressure

C. None of the above

D. AV Valve closes

A. Marks the onset of diastole

C. Is occasionally split

D. Due to closure of semilunar valves

A. Q wave

B. P wave

C. R wave

A. Diopters

B. Daltons

D. Pounds